His Dark Materials

In Philip Pullman's His Dark Materials and The Book of Dust trilogies, Dust or Rusakov particles are elementary particles associated with consciousness that are integral to the plot. Dust features in the multiverse written about in these trilogies and companion books. In these universes, Dust is attracted to consciousness, especially after puberty; the Church within the series associates it with original sin and seeks its end. Pullman described Dust in a 2017 interview as 'an analogy of consciousness, and consciousness is this extraordinary property we have as human beings'. In Northern Lights, Lord Asriel reveals the origins of the term 'Dust' to be from a passage from the slightly alternative version of the Bible in Lyra's world: "In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou art, and unto dust shalt thou return" (Genesis 3:19). Dust was previously known (in Lyra Belacqua's universe) as 'Rusakov particles' named after their discoverer, Boris Mikhailovitch Rusakov. Rusakov discovers a field permeating the universe enabling consciousness; before the discovery of Dust, its existence is predicted, as 'the existence of a Rusakov field implies the existence of a related particle'. Mary Malone researches Dark Matter in an alternative universe, referring to it as 'Shadows'. The name 'Shadows' was given to the particle by her colleague, Oliver Payne, in references to the Allegory of the Cave, involving 'Shadows on the wall'. When she is able to communicate with Shadows by interfacing with her detector, it confirms that they are the same as Dust and Dark Matter.

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